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26” tires are pretty large, with an 7:1 ratio at 3600 rpm you’d be doing around 40 mph. That’s some pretty tall gearing. My guess is that your engine doesn’t have enough power or air flow to run any higher RPMs. I’m not sure what your muffler system looks like, but that could limit rpm. My kart engine is exactly the same as yours except for just a header for the exhaust. I lost almost 1000 RPMs on the top end when I switched the stock exhaust back onto the engine from the straight pipe. The airflow makes a big difference.

I’m not sure what kind of top speed you are looking for or currently getting, but I would say gearing down wouldn’t hurt. You’ll have better acceleration and most likely higher top end rpm.

I had the stock one on it originally but once I put my home made one on it added some speed it's only getting up to 32 but my torque converter wont engage so that's why I'm trying to get a bit more rpms

40 in a small kart is pretty fast. I don't know where you ride but Ive got wide open flat dirt. I'd love to be able to break 40mph and I can gear for it, but I find it so much funner to gear lower and have a tire fryer that tops at 30-35mph.
When the rear wants to get in front and you can drift and donuts all day long it really puts a smile on my face.

I'm doing more street riding it's a dirt bike frame that I'm turning into a "motorcycle" of sorts so I'd like to at least get to 40 if possible

You say your TC won't engage. What do you mean by that?
If your getting that fast with it stuck in low....

Ya it's still in low the pulley around the drive shaft fully opens but the one on the right with spring isn't opening up. Does it normally plato for a while before it engages because at the moment the length of road I've driven it on is about 1/8 mile maybe a tad longer.

Ya it's still in low the pulley around the drive shaft fully opens but the one on the right with spring isn't opening up. Does it normally plato for a while before it engages because at the moment the length of road I've driven it on is about 1/8 mile maybe a tad longer.

If the load on the torque converter is too great, and the motor cannot maintain/gain rpms, it will stay in a lower gear to compensate.

Did you try running it on jackstands, and observe clutch function with no load?

Even if the torque converter is working exactly as it should, with your gearing, it simply will not preform as well as it could.